JPH06249589A - Heat exchanging fin - Google Patents

Abstract

PURPOSE:To provide a heat exchanging fin in which a water flow tube and a fin sheet and the tubes can be sufficiently effectively brazed to each other at a shoulder of a potbelly type insertion hole and hence a crack scarcely occurs due to thermal stress, etc. CONSTITUTION:A heat exchanging fin comprises brazing material insertion holes 41, 42 for brazing heat exchanging water flow tubes 1, 2 to a fin sheet 10 having many potbelly type insertion holes 20 for inserting the tubes 1, 2 of a one-boiler two-circuit type to be opened and arranged at peripheral edges of the holes 20, wherein the holes 41, 42 are disposed at obliquely upper positions of the peripheral edges of the holes 21, 22 above and below the holes 20.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to heat exchange fins.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing an example of a conventional heat exchange fin. The conventional technique will be described with reference to this figure. In a so-called one-can, two-circuit type heat exchanger, a plurality of fin sheets 10 are arranged at regular intervals, and two types of water exchange pipes 1 and 2 for heat exchange are provided therein. It is brazed in a penetrating form. That is,
The fin sheet 10 is formed with a large number of Dharma-type insertion holes 20 in which the lower part of the upper insertion hole 21 and the upper part of the lower insertion hole 22 are continuous so that the two water pipes 1 and 2 come in contact with each other vertically. To be done. And in the insertion hole 21 above this Dharma type insertion hole 20,
For example, the water pipe 1 of the bath reheating circuit is inserted, and the water pipe 2 of the hot water supply circuit is inserted into the lower insertion hole 22. 2 above
The brazing of the water pipes 1 and 2 of the book and the fin sheet 10 is performed by the pair of brazing material insertion holes 31 and 31 at the top of the peripheral edge of the insertion hole 21 above the dharma type insertion hole 20 and the dharma type insertion hole 20. The brazing material insertion holes 32 and 33 are provided on the shoulders on both sides of the constricted part, and the brazing material 3 is inserted into these holes 31, 32 and 33, so that the water pipes 1 and 2 are in a horizontal state and the fin sheet. It was heated and brazed so that 10 was in a vertical state.

[0003]

However, a brazing material insertion hole 31 is provided at the top of the peripheral edge of the insertion hole 21 above the dharma type insertion hole 20 and on both side shoulders of the dented type of the dharma type insertion hole 20. ,
In the conventional heat exchange fins in which 32 and 33 are arranged, when brazing, the melted wax flows down along the outer periphery of the dharma type insertion hole 20, and the wax to the narrowed part of the dharma type insertion hole 20. However, there is a problem in that brazing of the water pipes 1 and 2 and the fin sheet 10 and the water pipes 1 and 2 at that portion is insufficient.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and brazes the water pipes 1 and 2 and the fin sheet 10 in the dented portion of the Dharma type insertion hole 20, and the water pipe 1,
It is an object of the present invention to provide a fin for heat exchange in which brazing of two members can be performed sufficiently reliably, and thus cracks are less likely to occur due to thermal stress or the like.

[0005]

In order to achieve the above object, the heat exchange fin of the present invention has a large number of Dharma type insertion holes for inserting two heat exchange water pipes of one can and two circuit type. A fin for heat exchange, wherein a brazing material insertion hole for brazing a heat exchange water pipe is arranged at a peripheral portion of the dharma type insertion hole, wherein the brazing material insertion hole is the dharma type. It is characterized in that it is arranged at an obliquely upper position of the peripheral edge of each of the insertion holes above and below the insertion hole.

[0006]

According to the above feature of the present invention, the brazing material insertion hole is disposed at an obliquely upper position of the peripheral portions of the upper and lower insertion holes of the dharma type insertion hole, whereby the brazing material insertion hole is inserted into the brazing material insertion hole. State in which the whole fin sheet is tilted so that these brazing material insertion holes occupy the highest positions around the upper and lower water pipe insertion holes during brazing and heating. By melting the brazing material with, the brazing material is sufficiently supplied to the dented part of the dharma type insertion hole, and brazing of the water pipe and fin sheet at that part and brazing of the water pipes to each other is reliable. Done.

[0007]

1 is a view showing an embodiment of a heat exchange fin of the present invention, FIG. 2 is a detailed view of a dharma type insertion hole portion, and FIG. 3 is a state of the heat exchange fin at the time of brazing. FIG.

A plurality of dharma type insertion holes in the fin sheet 10.
20 are pierced and each dharma type insertion hole 20 is an upper insertion hole.
Since the lower part of 21 and the upper part of the lower insertion hole 22 are connected in a continuous manner, the vicinity of the center is crimped. The peripheral portions of the upper and lower insertion holes 21 and 22 excluding the cut portion near the center are burring edges 23. In the present embodiment, the brazing material insertion holes 41, 42 are arranged at the diagonally upper right positions of the peripheral portions of the upper and lower insertion holes 21, 22. In this example, they are arranged at an angle position of 30 degrees from the horizontal position. The brazing material insertion holes 41, 42 are provided in contact with the outside of the burring edge 23 so as not to interrupt the burring edge 23. In addition, a small brazing material insertion hole 43 is also provided in the necked portion near the center of the dharma type insertion hole 20.

A plurality of fin sheets 10 constructed as described above are arranged at regular intervals, and the two water pipes 1 and 2 are respectively passed through the insertion holes 21 and 22 of the Dharma type insertion hole 20 and the brazing material. 3 through the brazing material insertion holes 41, 42, 43, and by arranging them in one direction as shown in FIG. 3, the brazing material insertion holes 41, 42 are respectively inserted into the upper and lower insertion holes. Hole 21,
Try to occupy the highest position around 22. By heating in this state, the melted wax, in particular, the wax melted in the brazing material insertion hole 42 of the lower insertion hole 22 has a sufficient amount in the cracked portion of the Dharma type insertion hole 20 located nearby by gravity. Flow naturally, and the water pipes 1 and 2 and the fin sheet 10 in that part
And brazing with the water pipes 1 and 2 are surely performed. By arranging the brazing material 3 also in the brazing material insertion hole 43 provided in the vicinity of the cracked portion of the dharma type insertion hole 20, brazing of the cracked portion becomes more reliable. Further, since the brazing material insertion holes 41, 42 are provided without interrupting the burring edge 23, the melted wax smoothly flows along the surface of the burring edge 23, and the wax is easily spread all over. Incidentally, by adjusting the inclination of the fin sheet 10 to 60 degrees corresponding to the positions of the brazing material insertion holes 41 and 42 at 30 degrees,
The brazing material insertion holes 41, 42 can be placed at the highest position.

[0010]

According to the heat exchange fin of the present invention, the present invention has the above-mentioned structure and operation. The dharma type insertion through which two heat exchange water pipes of one can and two circuits type are inserted. A fin for heat exchange, wherein a brazing material insertion hole for brazing a heat exchange water pipe is arranged at a peripheral portion of the dharma type insertion hole for a fin sheet having a large number of holes. Since the holes are arranged at diagonally upper positions of the peripheral portions of the upper and lower insertion holes of the dharma-type insertion hole, the dharma-type insertion hole can be brazed by appropriately tilting the heat exchange fins when brazing. It is possible to braze the water pipe, the fin sheet and the water pipe to each other in the broken portion sufficiently reliably. Therefore, it is possible to provide a heat exchange fin that is unlikely to crack due to thermal stress or the like.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a heat exchange fin of the present invention.

FIG. 2 is a detailed view of a dharma type insertion hole portion.

FIG. 3 is a diagram showing a state of a heat exchange fin during brazing.

FIG. 4 is a diagram showing an example of a conventional heat exchange fin.

[Explanation of symbols]

 1 Upper water pipe 2 Lower water pipe 3 Brazing material 10 Fin sheet 20 Dharma type insertion hole 21 Upper insertion hole 22 Lower insertion hole 41 Brazing material insertion hole 42 Brazing material insertion hole

Claims (1)

[Claims] 1. A brazing material insertion for brazing a heat exchange water passage to a fin sheet having a large number of dharma type insertion holes for inserting two heat exchange water passages of one can and two circuit type. A fin for heat exchange having a hole arranged in the peripheral portion of the dharma-type insertion hole, wherein the brazing material insertion hole is arranged at an obliquely upper position of the peripheral portions of the upper and lower insertion holes of the dharma-type insertion hole. A heat exchange fin.